Ask an Expert (Page 14)

Question about Distance

Ask an Expert Topic Forum: Grades 6-8: Physical Science

Question about Distance Question about Distance up close, the plane is huge, about 45 people max. far away, the plane is about the size of a toy plane. Why is that? Re: Question about Distance Hi! This is all due to a concept called a “visual angle,” which is in your retina (in your eye). When closer, this plane, looks much larger because it appears as a larger visual angle in your retina, so it takes up more space in your field of view. When further, the visual angle gets smaller and the… Read more

upgrading trash skimming robot

Ask an Expert Topic Forum: Grades 9-12: Physical Science

upgrading trash skimming robot upgrading trash skimming robot hello! so i made it to regionals with my prototype of an rov with a net attached to collect trash in waters, but the teachers that judged my project worried about wild life getting caught in the net. my teacher wants me to upgrade my prototype with this feedback and i could use some suggestions. one judge told me to use a rotator to detect what is solid and what is wild life but im a bit confused? i went looking for rotators and… Read more

Ultrasonic levitator

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Ultrasonic levitator Ultrasonic levitator Posting on behalf of student Project: Ultrasonic levitator https://www.sciencebuddies.org/science-fair-projects/project-ideas/Elec_p121/electricity-electronics/ultrasonic-levitator ---------------- [attachment=0]hDtvwWgzz30vKCLCZaO9FZtgOzGZRUte4g.png[/attachment] Re: Ultrasonic levitator Hello, If this is your first Arduino project, we recommend going through at least the very first tutorial on this page:… Read more

MY light seeking robot

Ask an Expert Topic Forum: Grades 6-8: Physical Science

MY light seeking robot MY light seeking robot There is a problem with my speedy light seeking robot. The wheels are going at different speeds somehow. We did finish building and put all of things in the right spot on the bread board. Its just the motors that are moving at different speeds. We did have to switch one motor wires because the wheels went opposite ways. Heres a picture. [attachment=0]Screenshot 2025-12-03 3.35.29 PM.png[/attachment] Moderator note: Related Project: … Read more

Question about Making a Sugar Thermometer activity

Ask an Expert Topic Forum: STEM Activities

Question about Making a Sugar Thermometer activity Question about Making a Sugar Thermometer activity How does sugar affect kids energy? ------------------------------------- Leave this to help the Experts: The activity can be viewed at: [url=https://www.sciencebuddies.org/stem-activities/making-a-sugar-thermometer]Making a Sugar Thermometer[/url] Re: Question about Making a Sugar Thermometer activity Hi - It doesn't sound like this is related to this "Making a Sugar Thermometer" science… Read more

Mini Drone Problem with lift

Ask an Expert Topic Forum: Grades 6-8: Physical Science

Mini Drone Problem with lift Mini Drone Problem with lift Posted on behalf of family Project: https://www.sciencebuddies.org/science-fair-projects/project-ideas/Aero_p058/aerodynamics-hydrodynamics/diy-drone-how-much-weight (Or this activity: https://www.sciencebuddies.org/stem-activities/diy-mini-drones ) ------------------------ Hello, my son and I just completed the DIY mini drone and it’s not taking off. I was careful with the instructions and at first it did rise up about 6 inches and… Read more

Vitamin C glass vs plastic jar

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Vitamin C glass vs plastic jar Vitamin C glass vs plastic jar Posted on behalf of student Project: https://www.sciencebuddies.org/science-fair-projects/project-ideas/Chem_p044/chemistry/which-orange-juice-has-the-most-vitamin-c ------------------------------------------ Would it be possible to substitute the glass jar for a clean plastic one in the "Which Orange Juice Has the Most Vitamin C?" experiment? If so, does it have to be made of a specific kind of plastic? Re: Vitamin C glass vs… Read more

ARDUINO UNO R4 MINIMA

Ask an Expert Topic Forum: Grades K-5: Physical Science

ARDUINO UNO R4 MINIMA ARDUINO UNO R4 MINIMA Can I please have the instructions on how to activate bootloader mode on my ARDUINO UNO R4 MINIMA. I think this is why I keep getting the "exit status 74" error in Arduino IDE. Moderator note: Projects: … Read more

Exploring STEM Through Hands-On Projects: How Practical Activities Strengthen Scientific Thinking in the Digital Age

Ask an Expert Topic Forum: Using the Scientific Method and Engineering Design Process

Exploring STEM Through Hands-On Projects: How Practical Activities Strengthen Scientific Thinking in the Digital Age Exploring STEM Through Hands-On Projects: How Practical Activities Strengthen Scientific Thinking in the Digital Age In today’s rapidly evolving technological world, introducing students to STEM through hands-on projects has become one of the most effective approaches in modern education. Platforms like ScienceBuddies.org demonstrate that students learn scientific concepts more… Read more

Question About Project of Developing an E-Nose for the Detection of Breath VOC Makeup changes

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Question About Project of Developing an E-Nose for the Detection of Breath VOC Makeup changes Question About Project of Developing an E-Nose for the Detection of Breath VOC Makeup changes Hi! We’re building a low-cost e-nose to detect psychological stress from human breath VOCs (Volatile Organic Compounds), using MQ-3, MQ-135, MQ-138, CCS811, and BME688 sensors. The device will feed data to a machine learning model to classify “stressed” vs “relaxed” breath patterns, accounting for… Read more

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